**
spring-session+Redis完成session共享
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最近学习了spring-session完成session共享的配置，记录一下。
项目结构
1.pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>springsession</groupId>
<artifactId>springsession</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp.jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet.jsp.jstl/jstl-api -->
<dependency>
<groupId>javax.servlet.jsp.jstl</groupId>
<artifactId>jstl-api</artifactId>
<version>1.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.glassfish.web/jstl-impl -->
<dependency>
<groupId>org.glassfish.web</groupId>
<artifactId>jstl-impl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.springframework.session</groupId>
<artifactId>spring-session-data-redis</artifactId>
<version>1.3.1.RELEASE</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>biz.paluch.redis</groupId>
<artifactId>lettuce</artifactId>
<version>3.5.0.Final</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.2.9.RELEASE</version>
</dependency>
</dependencies>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>2.4</version>
<configuration>
<warSourceDirectory>WebContent</warSourceDirectory>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
</project>
2.web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>springsession</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath*:application-context.xml
</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--DelegatingFilterProxy将查找一个Bean的名字springSessionRepositoryFilter丢给一个过滤器。为每个请求
调用DelegatingFilterProxy, springSessionRepositoryFilter将被调用-->
<filter>
<filter-name>springSessionRepositoryFilter</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSessionRepositoryFilter</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>REQUEST</dispatcher>
<dispatcher>ERROR</dispatcher>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
3.application-context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:annotation-config/>
<import resource="classpath:application-session.xml"/>
</beans>
4.application-session.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 加载properties文件 -->
<bean id="configProperties"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:session-redis.properties</value>
</list>
</property>
</bean>
<bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
<!-- 最大空闲数 -->
<property name="maxIdle" value="${redis.pool.maxIdle}" />
<!-- 最小空闲数 -->
<property name="minIdle" value="${redis.pool.minIdle}" />
<!-- 控制一个pool可分配多少个jedis实例,用来替换上面的redis.maxActive -->
<property name="maxTotal" value="${redis.pool.maxTotal}" />
<!-- 最大建立连接等待时间。如果超过此时间将接到异常。设为-1表示无限制 -->
<property name="maxWaitMillis" value="${redis.pool.maxWaitMillis}" />
<!-- 连接的最小空闲时间 -->
<property name="minEvictableIdleTimeMillis" value="${redis.pool.minEvictableIdleTimeMillis}"></property>
<!-- 每次释放连接的最大数目,默认3 -->
<property name="numTestsPerEvictionRun" value="${redis.pool.numTestsPerEvictionRun}"></property>
<!-- 逐出扫描的时间间隔(毫秒) 如果为负数,则不运行逐出线程, 默认-1 -->
<property name="timeBetweenEvictionRunsMillis" value="${redis.pool.timeBetweenEvictionRunsMillis}"></property>
<!-- 是否在从池中取出连接前进行检验,如果检验失败,则从池中去除连接并尝试取出另一个 -->
<property name="testOnBorrow" value="${redis.pool.testOnBorrow}" />
<property name="testOnReturn" value="${redis.pool.testOnReturn}" />
<!-- 在空闲时检查有效性, 默认false -->
<property name="testWhileIdle" value="${redis.pool.testWhileIdle}"></property>
</bean>
<!--创建一个Spring Bean的名称springSessionRepositoryFilter实现过滤器。
筛选器负责将HttpSession实现替换为Spring会话支持。在这个实例中，Spring会话得到了Redis的支持。-->
<!-- springsession支持 -->
<bean class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration">
<property name="maxInactiveIntervalInSeconds" value="${redis.session.timeout}" /> <!-- session过期时间,单位是秒 -->
</bean>
<!-- 采用JedisConnectionFactory -->
<bean id="jedisConnectionFactory"
class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory" destroy-method="destroy">
<property name="hostName" value="${redis.host}"/>
<property name="port" value="${redis.port}"/>
<property name="password" value="${redis.pass}" />
<!-- 连接超时时间 -->
<property name="timeout" value="3000"/>
<property name="usePool" value="true"/>
<property name="poolConfig" ref="jedisPoolConfig"/>
</bean>
</beans>
5.SessionServlet.java
package com.testspringsession.controller;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/session")
public class SessionServlet extends HttpServlet{
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String attributeName = req.getParameter("attributeName");
String attributeValue = req.getParameter("attributeValue");
req.getSession().setAttribute(attributeName, attributeValue);
resp.sendRedirect(req.getContextPath() + "/");
}
}
6.index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page isELIgnored="false" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Session Attributes</title>
<base href="<%=basePath%>" target="_blank" rel="external nofollow" >
</head>
<body>
<div class="container">
<h1>Description</h1>
<p>This application demonstrates how to use a Redis instance to back your session. Notice that there is no JSESSIONID cookie. We are also able to customize the way of identifying what the requested session id is.</p>
<h1>Try it</h1>
<form class="form-inline" role="form" action="./session" method="post">
<label for="attributeName">Attribute Name</label>
<input id="attributeName" type="text" name="attributeName"/>
<label for="attributeValue">Attribute Value</label>
<input id="attributeValue" type="text" name="attributeValue"/>
<input type="submit" value="Set Attribute"/>
</form>
<hr/>
<table class="table table-striped">
<thead>
<tr>
<th>Attribute Name</th>
<th>Attribute Value</th>
</tr>
</thead>
<tbody>
<c:forEach items="${sessionScope}" var="attr">
<tr>
<td><c:out value="${attr.key}"/></td>
<td><c:out value="${attr.value}"/></td>
</tr>
</c:forEach>
</tbody>
</table>
</div>
</body>
</html>
6.session-redis.properties
#redisIp
redis.host=127.0.0.1
#redisPassword
redis.pass=123456
redis.port=6379
redis.session.timeout=1800
redis.database=0
redis.timeout=1000
redis.userPool=true
redis.pool.maxIdle=100
redis.pool.minIdle=10
redis.pool.maxTotal=200
redis.pool.maxWaitMillis=10000
redis.pool.minEvictableIdleTimeMillis=300000
redis.pool.numTestsPerEvictionRun=10
redis.pool.timeBetweenEvictionRunsMillis=30000
redis.pool.testOnBorrow=true
redis.pool.testOnReturn=true
redis.pool.testWhileIdle=true
测试项目构建完成。
测试方法：启动本机redis，将项目放入两个tomcat容器，运行，从同一浏览器发送请求至不同的节点，观察显示结果。